Cumulative Security Update for Microsoft Edge (MS16-145)

ITS Advisory Number: 
2016-208
Date(s) Issued: 
Tuesday, December 13, 2016
Subject: 
Cumulative Security Update for Microsoft Edge (MS16-145)
Overview: 

Multiple vulnerabilities have been discovered in Microsoft Edge, the most severe of which could allow for remote code execution if a user views a specially crafted web page. Microsoft Edge replaced Internet Explorer as the default browser on Windows 10. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

Systems Affected: 
  • Windows 10

  • Windows 10 (Version 1511)

  • Windows 10 (Version 1607)

  • Windows Server 2016

RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

Multiple vulnerabilities have been discovered in Microsoft Edge that could allow for remote code execution. Details of these vulnerabilities are as follows:  

  • Two remote code execution vulnerabilities exist when affected Microsoft browsers improperly access objects in memory. (CVE-2016-7181, CVE-2016-7279)

  • Three information disclosure vulnerabilities exist when Microsoft Browsers do not properly validate content under specific conditions. (CVE-2016-7206, CVE-2016-7280, CVE-2016-7282)

  • Five remote code execution vulnerabilities exist in the way affected Microsoft scripting engines render when handling objects in memory in Microsoft browsers. (CVE-2016-7287, CVE-2016-7286, CVE-2016-7288, CVE-2016-7296, CVE-2016-7297)

  • A security feature bypass vulnerability exists when the Microsoft browsers fail to correctly apply Same Origin Policy for scripts running inside Web Workers. (CVE-2016-7281)

Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

Actions: 
  • After appropriate testing, immediately apply patches provided by Microsoft to vulnerable systems.

  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.

  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.

  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments, especially those from un-trusted sources.

  • Apply the principle of Least Privilege to all systems and services.